<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width">
    <title>Document</title>
</head>
<style>
    *{
        padding: 0;
        margin: 0;
    }
    .banner{
        width: 900px;
        margin: 0 auto;
    }
    .top,.bottom{
        width: 900px;
        height: 50px;
        background: #ccc;
    }
    .middle{
        margin: 10px 0px;
        background: #ccc;
    }
    .middle::after{
        display: table;
        content: "";
        clear: both;
    }
    .middle>div{
        width:286px;
       
        }
    .box{
        float: left;
    }
    .aa{
        background: #e4a8a8;
        margin: 10px 10px;
    }
    .bb{
        background: #a9bba7;
        margin: 10px 10px 10px 0px;
    }
    .bb-aa{
        float: left;
        width: 75px;
        margin: 5px 5px;
        padding: 0 5px;
        background: #cfcfcf;
        height: 90px;
    }
    .bb-bb{
        float: left;
        width: 75px;
        margin: 5px 5px;
        padding: 0 5px;
        background: #cccccc;
        height: 90px;
    }
    .cc{
        background: #ecb35c;
        margin: 10px 10px 10px 0px;
    }
</style>
<body>
    <div class="banner">
        <div class="top"></div>
        <div class="middle">
                <div class=" box aa">
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                </div>
                <div class=" box bb">
                    <div class="bb-aa"></div>
                    <div class="bb-aa"></div>
                    <div class="bb-aa"></div>
                    <div class="bb-aa"></div>
                    <div class="bb-aa"></div>
                    <div class="bb-aa"></div>
                    <div class="bb-aa"></div>
                    <div class="bb-aa"></div>
                    <div class="bb-aa"></div>
                </div>
                <div class=" box cc">
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                    <div class="bb-bb"></div>
                </div>
        </div>
        <div class="bottom"></div>
    </div>
</body>
</html>